Internal combustion engine



FIG. 1 is a top, front, and left side perspective view of an internal combustion engine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and

FIG. 7 is a right side elevational view thereof. 

The ornamental design for an internal combustion engine, as shown and described. 